Features： 1、 COMPATIBLE: Ideal for FLT4825 b air purifier replacement filter, compatible with CDAP4500BCA CDAP4500WCA AC4900 AC4850pt AC4300wpt AC4300 AC4900ca AC4825 replacement filter, comparable to the original 2、 PERFORMANCE: Filter size b FLT4850PT uses H13 for true high efficiency particulate arrestment 3、WORTH PACKAGE: Combo includes extra 2 pre filters and 2 H13 true high efficiency particulate arrestment filters. You get all the advantages of an original air filter and save a lot for your year round air purification needs 4、EASY TO INSTALL: No tools required, in order for your air purifier to work properly, which is a good replacement 5、 COTTON: Adopt cotton material, which is porous, hygroscopic, heat resistant, you can use with confidence Specification： Item Type: High Efficiency Particulate Air Filter Element Material: High efficiency particulate arrestment, cotton Package List： 2 x Filter(with pre filter) 1 x User Manual